Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 58
Fig. 46. W4325. Fig. 47. W4330. … Fig. 49. W4333. 54 AONE PORTABLE TESTING SET • For all Kind§ of Electrical Testing ; Invaluable to the Scientist or the Engineer, in the Laboratory or the Shop.
Electric apparatus and appliances · Equipment and supplies
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